Grinding-machine.



O. R. CARPENTER.

GRINDING MACHINE. APPLIOATION FILED D2014, 1909.

Patented Apr. 2, 1912.

8 SHEETSSHEET 1.

o Q U lmi tmcoow C. R. CARPENTER GRINDING MACHINE.

APPLICATION FILED 11130.14, 1909.

1,022,224. Patented Apr. 2, 1912.

8 SHEETS-SHEET 2.

3; W Mil O. R. CARPENTER.

GRINDING MACHINE. APPLIOATIONYIILED 1150.14, 1909 Patented Apr. 2, 1912.

a SHEETS-SHEET 3.

G. R. CARPENTER.

GRINDING MACHINE.

APPLICATION rum) DEO.14. 1909.

Patnted Apr. 2, 1912.

a SHEETS-SHEETL 5M mmamaaw Ill O. R. CARPENTER. GRINDING MACHINE.APPLICATION FILED DEO.14, 1909 1,022,224. I Patented Apr. 2, 1912.

' 8 SHEETS-SHEET 5. P

G. R. CARPENTER.

GRINDING MACHINE. v APPLICATION FILED DLEO.14,1909.

Patented Apr. 2, 1912.

8 SHEETS-SHEET 6.

jg .251 G El @044 w Patented Apr. 2, '1912.

a sinus-sum 7.

dlii 7 tie 80 QOW/"Q I W 1% 01mm? 0. R. CARPENTER.

GRINDING MACHINE. APPLIOITION FILED DEO.14. 1909.

1,022,224. Patented Apr. 2, 1912,

e sums-sums.

H nummw 1 1}} a? H w I R? t m v Q? 2 E UNITED STATES PATENT OFFICE.

GHABLES R. CARPENTER. 0Z5 RAGINE, WISCONSIN.

GRIQTDINGJYIACHINE.

Specification of Letters Patent.

Application filed December 1-1. 1369." Serial No. 533,901.

To all whom it may concern Be it known that I. CiIAnLns R. C.x-I:1 r:X--man. a citizen of the United States. residing at liacine, Racine county.Wisconsin. have ments in. Grinding-l\.lachinesz and I do, hereby declarethe fol-lowing to be a full, clear, and exact description oftheintention, such as will enable others skilled in the art to whichitappertains to make and use the same.

T his invention relates to certain improve ments in grinding machines;and the objects and nature of my invention will be readily understood bythose skilled in the art in the light of the following explanationsofthe accompanying drawings illustrating what I now consider mypreferred embodiment from among other formations, arrangements andcombinations Within the spirit and scope of my invention.

The invention consists in certain novel features in construction and incomblnations and arrangements of parts as more fully and particularlyset forth hereinafter.

Referring to the accompanying drawings: l igure l, is a front elevationof a machine embodying my invention; my preferred form of table feedworks being shown applied to the right hand table, the two tables beingshown at their limits of upward movement. Fig. 2, .is aside elevation,the table being shown in an operative position. Fig. 3, isan elevationshowing theright hand table in the position shown by Fig. 1. Fig.

3, is a detail perspective view of the table carriage and the lever feedworks, the table being removed. Fig. 4:, is a vertical section ontheline l4, Fig. 3. Fig. 5, is a top plan view of the structure of Fig.vertical section on the line 66, Fig. l. F

.7, is a vertical detail sectional elevation on the line 77, Fig. 4.Fig. 8, is a vertical section on the line 8 -8 Fig. 4. Fig. 9, is a.

vertical section on the line 9 9, Fig. 4. Fig. 10. is a detailperspective of one of-the clamping blocks of Fig. 9. Fig. 11, is avertical section showing the feed works of the left hand. table ofFig. 1. Fig. 12,-is an enlarged sectional viewthereof. 'Fig. 13, is

a top plan of the protractor and part of the work table. Fig. 14, is across section of the protractor, parts thereof being shown sepa rated. v

In the specific example illustrated, 1, is an upright base, frameor'jpedestal at its Fig. 6, a

l upper front portion provided with a pair of horizontal alined andspaced journal boxes 2. in which the horizontal rotary shaft or v arbor3, is mounted. at is axlriving pulley invented certain new. and use'tulImprovearranged on said shaft between the boxes 2.

= The opposite. projecting ends of the arbor o. are provided with thegrinding disks 5 arranged beyond the side faces of the base 1 andsultably fixed on the ends of the arbor.

Patented Apr. 2, 19 12. i

These disks or grinding heads 5 are provided with any suitable verticalgrinding surfaces "at their flat outer faces. For ,instance, said heads5, can be formed by flat circular metal disks on the vertical outerfaces of which renewable sheets or disks of abrading material aresecured. although I do not wish to solimit my invention. In the exampleillustrated, I show a pair of grinding disks or heads, that is right andleft 'haiid disks. but I do not so wish to limit my invention for if sodesirechbut one grinding disk or head can be employed as willbeunderstood by those skilled in the art.

York tables or supports are provided for the grinding heads-and thesetables are arranged at the outer vertical grinding faces of said heads,-and means are provided whereby each. table-is vertically adjustable.

and wherebyeach table an be fed toward and from the grinding face, andwhereby the table can be tilted to the desired angle from thehorizontal. I show two ma; tables 6,

one for the right hand grinding disk "and the other for the left. handgrinding disk. dlach table is provided with its independent supportingand controlling devices, and I do not wish to limit my invention to theem ployment 0f the-two independent tables, in-

asmueh the machine even though having two grinding disks or heads, mightbe proaided with butonewor'k table. In the example illustrated. I show aflat-topapproxi mately rectangularwork table 6, at'the central portionof its under part having a pair of dependingspaced lugs or ears '7between which is received the vertical upwardly ektending ear 8' of atable feed carriage 9. The table is secured to said carriage by means ofa transverse clamping and pivot 7 bolt 10 passing through thelugs T andears 8, and at one end provided with a nut and at the opposite endprovided'with a depending handle 11. whereby the bolt ran be rotated 1nthe lugs and ear to loosen the table so that the same can be oscillatedon the bolt as a center and whereby' the .bolt can be adjustment. In theexample illustrated, the

bolt is arranged in a vertical plane parallel with the plane of thegrinding surface so that when the table is tilted on the bolt as a Icenter the inner straight edge of the table adjacent to the grindingsurface, will move vertically. The angle of inclination of the topsurface of the table with respect to the plane of the grinding surfaceis determined by a depending finger or pointer 12, at its lower freeedge portion having a, suitable index mark or the like. At its upper endthis pointer is formed with a hub arranged between the ear 8 and one ofthe lugs 7 and loosely receiving the pivot and clamping bolt 10. i

The pointer isheld to rock with the table 6 and on the bolt 10 by meansof horizontal oppositely projecting arms '14 from the quadrant huband'immedia-tely beneath the table, in connection with set screws 15carried by and vertically adjustable through said arms 14 intoengagement with the under side of the table. at a side face of the feedcarriage 9, and the feed carriage 'is cast or otherwise provided with araised or laterally'projecting segment 16, at its inner or concaved edgetraversed by the free end of the pointer and formed with a graduatedscale indicating various angles which can be assumed by the table. Theindex onv the free end of the pointer is adapted to register with anyone need only observe the graduation on the fixed scale indicating thedesired angle and thentilt the table until the pointer index coincideswith such graduation, and furthermore my said improved construction willreduce the cost'of production over the common quadrant arrangement.

If so desired, the work table, intermediate its length and width, can beprovided with vertical holes 17 extending therethrough to receive boltsorother means for clamping fixtures or the like, in the desired positionv on the table. I'also provide an improved table pro-tractor whereby thehorizontal angle of the work with respect to the grinding surface can bedetermined. The vertical angle of the work with respect to the grindingsurface is determined by the angle of inclination of the table attainedby oscillating the table on the pivot and clamping bolt 10 or otherequivalent means.

The protractor comprises a flabhead body or block 18, restinghorizontally on and adjustable over the top face of the table andremovably secured thereto.

The pointer depends in length preferably less than the width of thetable, and is straight throughout the length of-- one. longitudinal edgeand throughout the length. of said straight edge is formed with a grooveor slideway 19 opening through the vertical edge face of end of theblock can be beveled off to form an acute angle at its juncture withsaid straight longitudinal edge, and the outer or rear end of the blockis -"eferably curved .to'form a segment of a circle and 1s beveled offand provided witha scale or graduati'ons 20. 21, is an elongatedstraight protractor blade forme'C to fit said straig t longitudinal edgeof the protractor :Iltl lie thereagainst and parallel therewith and tobe' movable or adjustable longitudinally thereof. To this end, the rearvertical face of the blade is throughout its length formed "withlongitudinal projecting flange 22, formed to fit longitudinally withinthe blockgroove 19, and to slide longitudinally therein and thereof,when released from means clamping the blade to the block. Means areprovided to maintain the blade parallel with the block edge and to holdthe blade to the block edge. For instance, the flange can be formed witha Vshaped groove 23', in

its top face and extending throughout the length thereof, to receive theconical ends of set screws 24, adjustable in the block 18 and accessibleat the top surface of the block. These screws can be easily adjustedtomaintain the desired position of the blade and to tighten or loosenthe same. Atits inner end the blade can be transversely beveled tocoincide with the bevel of the inner end of the protractor block.

Suitable means are provided for re1nov-' ably coupling the protractor tothe table and whereby the protractor can be clamped in the desiredadjustment. For instance, I show the protractor block formed withtransverse bolt hole 25, arranged intermediate the ends ofthe blockandadjacent the straight longitudinal edge'thereof' and in-- tersecting thegroove or slideway 19. Thishole 25, receives theprotractor-clampingand-pivot bolt 26 adapted to pass freely andvertically t'herethrough and having a head to clamp down on the topsurface of the block and a downwardly projecting threaded lower end toscrew into'the table and-thereby clamp the block down on the table. Atan intermediate portion in its length' the bolt is reduced in diameterto provide reduced portion 27, in the horizontal plane of the protractorblade groove 19, where the bolt hole intersects the groove 19. Thisreduced portion 27, is in length preferably greater thanthe width of thegroove 19, and

the flange 22 of the protractor blade pro- This block is jects thereintoand prevents withdrawal of CTC the bolt from the block unless the bladehas been moved longitudinally a distance to clear said bolt. The bolt isthereby loosely confined to the block when the block isremoved from thetable, yet-the bolt can be screwed into or from the table to secure orpermit removal of the block without removing the blade. The reducedportion ofth'e bolt is of such length as to permit vertical movement ofthe bolt to lock the block to the table and to sutliciently loosen theblock to permit horizontal swing thereof onthe bolt as a pivot, evenwhile the blade is in normal position. If so desired, the protractorblock can be horizontally slotted at 30, inwardly through the inner wallof the groove 19, and adjacent to the bolt hole 25, so that when theblock clampingboltis tightened the opposite walls, of the groove will bepressed against the blade flange to tightly grip and lock the same;However, I do not wish to so limit all features my invention. i v l Iprovide the table with a series of threaded vertical sockets or holes28, to removably and individually receive the protractor clamping andpivot bolt 26. These sockets 28 are preferably uniformly spaced apartand are all arranged the same distance from a point atthe frontedge ofthe table,'say about at the center of the length of said edge of thetable, so that the series of sockets is arranged in a curved line or areof a circle. The protractor clamping bolt is adapted to enter any one ofthese sockets and to secure the protractor with its blade point at orabout atsaid central point along the front edge of the table.

' The protractor can be arranged at various angles with respect to thefront edge of the tableby adjusting .the protractor clamping bolt todillerent sockets 28, and the different angles can be indicated bygraduations or scale marks 2!), onthe top' face of the table.

beyond the rear end otithe protractor block and-adapted to register withthe indications of the scale 20 thereof. of the block forms the centerof the are of the curved scale 20 or rear end of the block and the blockis pivotallv adjustable on'the clamping bolt as a center to vary theangle of the blade when the bolt is in any one of the sockets Q8.

,M v prot actor can be used on a work t=tble or support having astraight rear or back edge which is of lulvantage,jin certain instances.inasmuch as the operator is thereby tumbled to square up his work'orfixtures The belt hole of the protraetor about itspivot-and-clampingbolt as a center 0 about any one of the table sockets28, for said bolt, as a center, as will be readily understood by thoseskilled in the art.

The table and its carriage are u'iounted on and ca'rried by a(ounterbalaneed swingable frame or rocker arm fulerluned a distancebelow the table on a horizontal 't'ulcrum, the horizontal axial line ofwhich is at right angles to the vertical plane of the grinding surfaceso that oscillation of said rocker arm carries the table across the faceof the grinding surface in a vertical plane parallel therewith. I Thearm-supporting fulcrum is vertically adjustable to raise and lower therocker armand. table; said. fulcrum being preferably bodily mo able oradjustable in a curved line about a fixed center while maintaining itshorizontal position. The rocker arm 31 is'vertically arranged and at itsupper end is formed with a horizontal elongated tablecarriage-receivingstud 32, usually cylindrical in cross section and projecting therefromtoward the grinding surface. At its lower end, said rocker arm is formedwith a horizontal hub or journal box 33, parallel with said stud. 32,and 'arrai'iged below the same. This hub receives and is mounted to turnor oscillate on the horizontal Stud 3%, parallel with thetable-carriiagestud 32, and

constituting the rocker arm fulcrum 'and. support. I If so deslretl, thebearing hub-33,

can be longitudinally split on one side and held adjustablyclosed byscrews 35, liners being employed if so desired, so that wear can betaken up and the desi ed fit of the hub on the stud can be maintained.

Any suitable device can be provided for maintaining the hub on thefulcrum stilt-134,

and against longitudinal movement there from. I For instance, I show asplit collar or ring 36, removably clamped on the reduced end of thestud 3", projectingoutwardly beyond the end of the hub.

The rocker arm is preferably counterbalanced to constantly tend tomaintain its normal vertical. position, For instance. I show a rightstraight bar -37, depending from the rocker arm hub and at its upper endfixed thereto and suitably longitudinallythreadcd at its lower end toenter and screw into the threaded bore of counterweight 38, carried. byand adjustable longr tudinally of said bar.

Suitable means are provided for locking the table-carryipg rock arm toand against oscillation on the supporting fulcrum 34. For instance, asmeans which can be provided for this purpose, l show a pair of.

slidable opposing clai-nping or looking blocks 39, arrangedwithin andtransversely of the lower portion of the hub below said fulcrum stud 34,and at their inner upper cornersconcaved, beveled or recessed at 40, tofit opposite portions, respectively, of the under surface of the stud.The two slidable clamping blocks have alined bolt holes extendinglongitudinally therethrough, to receive the clamping bolt- 41, at oneend having an exterior depending handle 42,

and an exterior head abutting against the outer end of one block, and anexposed nut 43, at its opposite and threaded ,end and I abutting againstthe outer end of the other block, whereby by rotating said bolt in onedirection through the medium of said handle, the blocks can be forcedtoward each other and against the stud to rigidly clampthe hub and studtogether, or by rotating the bolt-in the opposite direction the pressureon the blocks will be relieved to permit free turning of the stud withinthe hub or of the hub on the stud. The hub is formed with a transversepassage -extending through its lower portion and opening into the boreof the hub to receive said clamping blocks and form a housing andslideway therefor and said passage is arranged about at the center ofthelength of the hub. By this arrangement, when the blocks are drawntoward each other to clamp the fulcrum stud the hub is drawn downtightly and squarely on the longitudinal' top portion of the studwithout tending to tip the rocker arm from its proper vertical positionwith respect to the face of the grinding surface, thereby preventing thetable or work holder from being thrown the same for oscillation on thefulcrum stud.

If so desired, one of the clamping blocks.

39, can at its outer end be provided with "a transverse straightshoulder 44, spaced a distance fromthe bolt hole through the block toform a stop or'bearing abutment for the nut 43, to prevent rotation ofthe nut, and yet to permit turning of the nut on the bolt when the bolthas been un-' threaded from the nut such 'a distance-that the bolt canbe pushed through the blocks.

to carry the nut outwardly clear of the shoulder for the purpose ofadjusting the nut to bring the handle 42, in any desired position.

If so desired, adust proof inner thrust bearing can be provided betweenthe rocker arm hub and its supporting fulcrum stud, or shaft. Forinstance, I show the fulcrum stud reduced at its outer end from a pointwithin the outer end nortion of the hub to form the annularoiitwazdly'facingbearing or thrust shoulder 45, while the hub isinternally and annularly enlarged in the transverse plane of saidshoulder forming an annular oil groove 47, around the same and isinternally reduced outwardly beyond said shoulder to form the annularbearing surface 46, opposing and running in en fixed to and projectinghorizontally from the hub for supplying lubricant to the in-' terior ofthe hub.

Mechanism is provided for supporting and raising and lowering the rockerarm and table carrying fulcrum stud 34, and preferably whereby the sameis supported from and swingable about'a certain center throughthefmedium ofa radial arm or the like, For instance, I'show said studcarried by and projecting outwardly from theotherwise free end of aradial or crank arm 50, usually formed in one piece with said stud andprojecting radially from the outer end portion of and usually formed inone piece or otherwise rigid'with a crank hub or sleeve 51, mountedlongitudinally and turnable on: a fixed horizontal shaft 52, parallelwith and arranged below the arbor 3, and also parallel with the fulcrumstud .34, and the carriage supporting stud 32. The fixed shaft 52, inthe specific ex ample illustrated, extends transversely across the frontportion of'the -base a distance below the rotary arbor 3, and is securedand fixed to the base by boxes or clamps 53, with its opposite endsprojecting beyond the frame sides to carry the crank sleeves or hubs 51,ofthe worktabl'esor supports at the opposite sides of the machine, wheretwo sets of work tables and supporting. devices are employed, although Ido not so wish to limit my invention. The crank hub can rotate oroscillate on its shaft 52, to swing its radial arm vertically-andthereby carry its fulcrum stud 34, up and down 'to vary. the verticalposition of the rocker arm andwork table carried thereby.

'The crank hub is suitably confined on the shaft, as by removable collar'54, and the end portion ofthesha-ft can be reduced to form the annularthrust bearing surface 55, within the crank hub, and opposed and engagedby annular internal reduced portion 56, of the hub, and sur-' rounded byinternal annular oil groove 57 all as described in connection with theinternal dust proof thrust bearing between the rocker arm hub and itsfulcrum stud.

The crank hub can also be provided with a longitudinalinternal oilretaininga'nd discrank hub can be provided with a locking or clampingdevice of the same construction as described, in connection with therocker arm huh, and comprising beveled-or recessed end slidabl eclamping blocks 59,

end having depending crank handle 61. Bv.

transversely housed in the upper part of the crank hub to act o'ipositely on the upper part of the shaft and controlled by bolt 60, atone end having aunt and at the opposite this arrangement a.very-powerful clampis provided 'which can be almostinstantaneouslyappliedor released, and by which the work table can 'berigidly lockedand held at any desired elevation attainable through the'are inwhich thefulcrum stud swings from shaft 52, as a center.

Ipreferably provide means for counterbalancing the crank arm and theload (fulcrum stud, rocker arm and work table) carried thereby,balancing spring acting on the crank hub for this purpose. I showaheavy' coiled spring 62, surrounding the inner end of the crank huh andat its outer or fixed end having an eye receiving pin 63, suitably livedwith respect to the crank hub, as by being secured to an adjacent partof the base or portion secured to the base. The

inner or movable end of the spring fittfllled .to the crank hub forpropelling said huh. I usually acljustably secure the inner end of thespring to the hub so that the power of the spring on the hubcan beincreased or diminished. For instance, I show the hub formed with anannular serieshf teeth or notches 64, and themovable end of the springprovided with hook 65, capable of being sprung successively intoengagement with said hooks to increase or decrease the tension of thesprlng, as will be'rcadilyiun- "derstoodby those skilled in the art. The

springwis so applied. tothe crankhub as 'to constantly exert its tensionto rotate the hub in a direction to raise the crank trim-rocker arm'andtahl-e,and to maintain the table at its limit of upward. movement ",withthe crank arm in a vertical position. In this normal elevated positionthe table. in the particular example illustrated, is not in operativeposition "ith r(. spect to the grinding disk but is elevate I theworking or grinding face of the grind ing disk, whereas the approximateproper operative working position of the table is attained when thecrank arm is in the hori- 'aont'al position in which position the springis designed ,to maintain the parts evcnl For instance, the- 'eratorean'raise or The rocker For instance, I provideia.

d approximately above though the crank hub isnot locked to its arm thatthe table will remain. in any de-' SlIfBd VfiItlCfll position evenwithout the application of said clamp and so that th'eopslight pressureof thehand in the desired the table from a lowered position it isionl itwill immediately rise to its limit ofup lower the table by a.

direction. "In fact, when desiring-to .raisey .necessaryto glvethesame ashghtstart when ward-position with the cranjkvarn vertical.

with a laterally extending horizontal rigid rod or handle 66, at one endfixed to the upper part of the arm usually just below thework table feedcarriage, andby which'the be conveniently manipulated and held.

The crank hub is preferably formed with a casing 67, for the balancingspring consisting of a vertical disk arranged between the spring andtheerank armand an annular inwardly extending flange surroundingthespring and protecting thesa ne against'grit and dust thrown-offby'th'e grinding disk particularly in -viewof the; fact that the lowerportion of the grinding disk is' arranged close to the space betweenthe-closed or disk end of said casing and. the crank arm is preferablyprovided arm, whereby the spring casing-also shields,

the mnerend .of the crank lnib'bearing. The outer ,wall or flange of thespring casing 67 is formed with a tapped hole receiv-- mg the stop pinor screw 68, projecting into the casing to engage the fixedspring-securing. pin 63, when the crank. hub has rotated to bring thecrank arm to the vertical position with the table at its limit of upwardmovement, and thus prevent continued rotation of the hub in the samedirection to carry the table down and up again by a complete rotation ofthe crank arm.

Important practical advantages are zit-- tained througl the employmentof .a swingable radial or crank arm forraising and lowering the workthereby avoid the necessity 'of employing finished and scraped flat orother sliding surfaces which are not only expensive and difficult inproduction but are always ex posed and open to the cutting and wearingaction of dirt and grit and the consequent tendency. to throwqthe'tableout of proper accurate.al-inement. A

By en' ploying the swingable work table supporting counterbalanced rockarm mountedon and-supported by a movable fulcrum, vertical a djustn'lentof .the fulcrum to raise and lower the table and. rock arm does noteffect the countcrbalancing of the table and rock arm. In ,other words,the table is counterbalanced independently of the fulcrum or of theposition thereof,- and table, inasmuch as I the horizontal stud .or'projection 32 rigid automatic or other devices are not required tomaintain the balancin of the table as the table supports are raise orlowered.-

Improved means and devices areem-' ployed whereby the work table can'beadusted toward and from the indin'g-face" or surface and'on or indepenently of the rocker farm. For instance, in the specific exampleillustrated, I show the table feed carriage 9, 'slidable. on andlongitudinally of with the upper end of the rocker arm and projectingtherefrom toward the grinding surface. The feed carriage-9, is shown inthe form ofa horizontally elongated block or casting in its.longitudinal upper; portion formed with an elongated longitudinalslideway or socket 69 opening through the -'rear end'of the carriage and-formed to re- .i a y the stud 32. Suitable means are providedvoscillation or playt ereon. 'For ceive therocker armstud 32inlongitudinal sliding adjustment. .This socket 69. is usuround in crosssection to conform vto stud 32 can be provided for by an oilcup key way70.

72 projecting laterally from the feed carriage and discharging through,a radial duct into annular internal oil groove 73 surrounding the socket69 and opening into the The lower longitudinalportion of thefeedcarriageis provided with a longitudinal internally screw threadedbore 74 open at the rear end: of the carriage, and closed at the frontend of'thecarriage. If so desired, the front end of thisb ore' canbeclos'e'd by removable screw plug 75. This lon itudinally andinternally screw threaded bore 74 is adapted to'receive a threaded endofthe carriage feed screw 7 6' adapted to rotate in said bore andthereby feed the carriage' longitudinally of and on the stud 32.

Various constructions of feed works can.

be employed for moving the carriage on the stud 32. For the left handtable,'of Fig. 1,

I show the feed screw .76 passing outwardly,

through the upper end portion of the rocker arm and mounted to rotate ina bearing therein. In this formation the feedscrew is provided with afixed collar 77, engaging the inner edge or end of the rocker armbearing for the screw-to prevent outward longitudinal movement of thefeed screw in the bearing while longitudinal movement of the 'feed screwin the opposite direction through the bearing is stopped by the ,en-

and grit, while leaving the hand or feed rocker arm.

gagement of the hub of the hand wheel 78, with the outer end surface 79of said feed screw bearing in the rocker arm. The hand.

wheel 78 is removably keyed onthe -proje'cting outer end of the feedscrew and is held thereon by removable nut 80, on'the threaded outerextremity of said screw.

The hand wheel 78- is provided with a circumfe'rentially adj ustahlestop block 81-having: a beveled projection extending into thecircumferential undercut slidew'ay 82. The

adjustable stop block .is providedjvith a clamping 'screw 83', 'wherebythe same can be locked tothe wheel or released to slide I way 82. y 3

' 84 is a stop pin, projecting from the end of the'rocker arm andadapted to engage the I stop block and prevent further feeding rotationof the hand wheel when the same has I moved in to a certain point int-heoperation of feeding the table, as will be well understood by thoseskilled in the art. The edge "of the feed wheel is preferably providedwith a-scule orgraduation (to t'housandths of an inch if so desired) fordetermining the adjustment of the stop block to feedthe table forwardaccurately the desired distance as is well understood by those skilledinthe art.

The .rear end of -the feed carriage is. formed with a rearwardly proecting flange in the form of an inverted U, forming a shield 85 closedatv the top and vertical sides and open at the bbttom and rear end anddesigned to cover and inclose theupper end of therocker arm and the feedscrew and rotect the cylindrical stud 32 and the eed screw andcoiiperatiug surfaces from dust wheel 78 exposed and readily-accessible;

For the purpose of supplying lubricant to "the feed screw, and the feedscrew bearing,

in the rocker arm, I show the feed .screw 78 formed with a central lonitudinal oil duct 86 opening through the from end of 'the screw into theinterior of the t readed bore '74, and at its rear end having a radialduct opening-into the feed screw bearing in the p The port-ion of thethreaded bore 74 of the feed carriage between the plug 75 and the frontend of'the feed screw 76, forms an oil chamber which can be supplied'with lubricant from an oil cup arranged at the exterior of thelower portion of the feed carriage. 'It will be observed that the feedscrew 76, is removable from the feed carriage by removing the hand feed\vheel from the outer end of the screw, and then slipping the feedcarriage forwardly screwcan be unscrewed rearwardly from the carriage.

I show the right hand feed table, Fig. 1, provided with-what .1 term alever feed works, removablyapplied there-to andcapafrom the rocker armstud, so that the feed 1 table and hereinbefore described.

ble of being substituted in place'o't the screw 76, with its hand feedwheel of the left hand This lever teed device comprises a micrometer oradjusting screw 88 screwing into the threaded bore 71- of the feedcarriage and having an elongated smooth cylindrical portion projectingthrough and a considerable distance beyond the feed screw bearing in therocker arm and longitudinally slidable therethrough. This adjustingscrew 88 is provided with a fixed collar 89 at its outer po'rticn .inrear of the rear outer end 79 of the.

feed-screw bearing in the rocker arm. 90, is a hand or finger knob onthe rear extremity of the screw 88 and keyed or otherwise securedthereto to rotate therewith. This knob usually is formed with anexterior 'milled surface and with a circumferential scale 91, usuallygraduated to thousandths of an inch. Between the knob 90 and the thrustor fixed collar 89., is arranged a block or sleeve 92 through which'thescrew passes and in which.it is free to rotate. This sleeve 9.2, is heldbetween. the knob 90 and collar 89 against longitudinal movement on thescrew, and said sleeve is provided with a raised portion 94. at-its topprovided with an index to register with the graduations on said knobgThis sleeve is formed with'a laterally extending.horizontal stud 95having a screw threaded outer extremity.

A rearwardly projecting hand lever .96 with a bearing hub 97 atlts'front end, isremovably supported by the handle rod 66, the hub 97being slipped longitudinally onto said rod 66 to rock thereon and formthe lever fulcrum. This lever hub 97, is formed with an upwardlyprojectinglateral arm 98 to which the front end bf link 99, is pivot--ally joined by horizontal pin 100. The rear end. of link 99, is formedwith a transverse bearing opening receiving the stud 95 of the sleeve 92and removably confined loosely thereon by one or more nuts. In applyingthis lever feed. mechanism, the handle hub 97 is slipped longitudinallyonto the rocker arm handle 66, and the loose link connection 99 can thenbe readily established between the lever hub and the screw sleeve 92. It

:will be observed that upward swing of the handle 96 will (through themedium of the link 99, and sleeve 92, hearing against fixed collar 89)move the adjusting screw longitudinally and forwardly through the rockerarm and carry the feed carriage forwardly, and that this forward slidingfeeding movement ot the screw rod is limited by the en'- gagen'ient or"thrust collar 89, with the rearend 79 of the screw rod bearing in therocker arm.

The length of the table carriage feeding stroke is varied by screwingthe screw rod 88,-inwardly into the carriage or outwardly thm'etrom tovary the rearward projection to the feed carriage.

thrust collar 89, and surface 79, when the screw rod and feed. carriageare at their limits of outward or return 1novements and ready, to starton the feed stroke. The length of the feed stroke is determined by thegraduations on the hand knob .90, in connection with the index 94-, and.the mechanism can be set to feed the distance desired by turning thescrew rod tl'irougl'i the medium of the hand knob until the desiredgraduation mark or indication registerswith the index. An accuratemicrometer adjustment is thus provided, and by pressing'the hand leverupwardly the work table can be fed forwardly at the desired speedand-pressure, and the length of the feed'stroke will be mostaccuratelygaged Instead of attaining this adjustment by screwing the adjustingscrew rod into or from. the feed carriage, the thrustcollar might beotherwise adjusted witlrrespect In the present in-. stance, I employ theadjusting screw rod having the thrust collar fixed thereon, inasmuch assuch lever feed as generally described can be readily applied tomachines having the feed screw and hand wheel by removing such feedscrew and wheel and substituting the lever 'feed therefor, or the leverfeedcan be ren'iovcd and the feed screw and hand wheel substituted. Thiswork-support-or-table feed of the hand le "er type, (I igs. 1, righthand, 2, 3, 3, 4, 5, 6,) which the preferred construction of thisinvention, is usually employed for manufacturing purposes as where aconsiderable number of similar devices are to be finished, and incombination: with jigs or fixtures, because the operator can so quicklyby one movement of the lever, withdraw the fixturea s'uflicient distancefrom the disk to permit sate removal of'the finished work and insertionof an unfinished piece, and can then'qui'ckly swing the lever and bringsaid workup against the disk for finishing.

The hand wheel and feed screw feed shown in Figs. 1, (left hand), 11 and19. is slower in action than the lever feed and is generally employedfor tool work or where only a few similar pieces are to be finished.

It is evident that various changes might be resorted to in the forms,constructions and arrangements of the parts described, and that elementsmight be omitted, and features added, without departing from the spiritand scope of my invention and hence I do not wish to confine myself tothe exact constructions and features illustrated.

lVhat I claim is 1. In a grinding machine, in combination, 10 a worktable having an ear, a table-feed carriage having an upwardly projectingear, a table clamping and,pivot bolt passing transversely through saidears and at one end provided with a depending bolt-rotating handle, anda pointer depending beside said carriage and at its upper end having ahub centered on said bolt, and means for confining the pointer tooscillation on said bolt with the table to indicate the angle ofinclionation of the table, said' carriage having a raised portion at the sidethereof and along which the'free end of'said pointer moves,

said raised portion having a table-angleindicating scale.

'2. A grindingmachine having counterbalanced work-table supporting andcontrolling means comprising a supporting fulcrum provided with andcarried by a counterbalanced radial arm having a hubturnso able on afixed center to raise and lower said fulcrumand thework table, said hubprovided with-clamping means for locking said i f arm in the desiredadjustment.

3. A worktable having supporting and controlling means comprising asupporting stud, a vertically movable radial arm carrying the same andprovided-with a hub, a supporting shaft on which said hub is turnable, atable-carrying rocker arm fulcrumed to said radial arm andcounte'rbalancing means to counterbalance the weight of the table andsupporting means carried by said stud.

4. A work table having supporting and movable radial supporting. armprovided with a hub turnable ab'out a fixed center, avertically-rockable table support fulcrumed ing said hub againstrotation. and counterbalancing means acting on said hub to balance'theload carried by said arm. I

5. A work table having supporting and controlling means comprising a'radial .supporting arm swingable. vertically about a fined center formoving the table vertically, counterbalancing means for balancing theload' supported by said arm, a table-carrying rocker arm mounted on thefree end ofsaid radial arm to swing thereon about an axis parallelwithsaid fixed center, and means whereby said arm can be locked in anyposition within its range of swinging movement. I 6. Verticallyadjustable work table supcontrolling means comprising a vertically tothe free end of said arm,'means for clampto" normally maintain itsupright position,

a 'radi' ;l lifting arm carrying said frame and swingable verticallyabout a fixed center to raise and lower said frame, said framebeingpivotally mounted on the free end of said arm, and counterbalancingmeans acting on said arm to' swing the same upwardly and balance theload carried thereby. v

8'. Work table supporting and controlling means comprising a radial'lifting. arm swingable'vertically about a center to raise and lower saidtable, a table-carrying rocker arm fulcrumed to and rising from saidradial arm, counterbalancing means constantly acting on said arm toswing the same upwardly and to balance the loadcarried thereby, and astop limiting the upward swing of said arm.

9. A work table having supporting and controlling means comprising aradial supporting arm swingable vertically about a fixed center to raiseand lower said table, a table-carrying rocker arm fulcrumed to saidradial arm, and a counterbalancing spring constantly tending to swingsa'id arm vupwardly and approximately balancing the load carried by saidarm.

10. A work table having supporting and controlling means comprising avertically swingable radial lifting arm provided with a hub supportedand turnable on a fixed shaft and providedwith a coiled counterbalancingspring constantly acting to rocarried thereby. i

tate the hub to elevate the arm and the load 11.. Work table supportingmeans comprising a stationary shaft, a hub mounted to turn on. saidshaft and provided with a lat: eral lifting arm for raising and loweringthe table, a coiled spring on said hub and connected thereto toconstantly tend to rotate said hub and elevate said arm and the: I loadcarried thereby, a stop limiting the u pj gj -ward swing of said arm,and clamping means carried by said hub for locking the same to saidshaft with the arm at the desired elevation. I

12. Work table supporting means com prising a stationary shaft, a hubturnable thereon and having a table raising and lowering arm, a. clampto secure the hub against turning on the shaft, anda. coiledcounterbalancing spring acting on the hub to rotate the same to elevatesaid arm and having adjustable connection with said hub.

' 13. In a grinding machine, in combination, a hubmounted to oscillateon a fixed axis and having a laterally projecting lifting arm,'a coiledcounterbalancing spring v on said hub and at one end connected theret0-to rotate the hub, means securing the opposite end of the-springindependently of the hub, and a stop limiting rotation of the hub, saidhub formed with a spring case.

tion, a basehaving a stationary shaft, a

hub mounted to turn on said shaft and pro} vided with a lifting'arin,Work table upholding means carried by the lifting arm, a

counterbalancing spring at one end coupled to the hub and at the otherend-confined to the base, said'hub formed with a dust shield for saidspring and consisting of an end disk 'likewall'and an outer annularlateral. flange.

16. In combination, in a grinding machine, a base, a shaft projectingtherefrom, a hub turnable' on the shaft, work table carrying means, saidhub having crank lifting connection with said table carrying means, acoiled counterbalancing spring at'its inner end coupled to said hub, .afixed pin to which the outer end of said spring is confined, and a stoppin carried by and rotating with said hub and adapted to engage saidfixed pin to limit the rotationof the hub.

17. In combination, an arm swingable vertically on a fixed axis, arocker arm supported by said swingable arm and pivotally.

mounted on the free end thereof on a :hoiiizontal axis, said rocker armbeing counterweighted to normally maintain a vertical its lower end provded with a hub mounted to turn on said stud, a clamp carried by said hubfor locking the same toand against oscillation on said stud, said rockerarm at its upper end having a horizontal extension, a table feedcarriage mounted to slide horizontally on said extension, a work tablemounted on said carriage, and table feeding devices between said arm andthe carriage. i

19..In combination, a horizontally disposed. supporting stud, means forsupporting the same, a hub mounted to turn on said stud, and a clamp forlocking the hub against oscillation on the stud and comprising a pair ofopposing clamp blocks arranged transversely of and housed and'slidablein the hub and having beveled'inner ends to respectively engage oppositeside port-ions of the stud, and manually controlled means for drawingsaid blocks toward each other to grip the stud.

20. In combination, a stud, a hub mount-' ed to oscillate. on'the stud,and a'clamping device for locking the hub against oscillation on thestud and comprising a pair ofv opposing clamping blocks slidable in andtransverselyof the hub and having alined boresand beveled inner cornersto engage the circumference of the stud, and a clamp applying andreleasing bolt extending longitudinally through the bores of'the blocksand provided with exterior actuating means.

21. In, combination, a horizontally disposedstud, means for-supportingthe same, a work table carriage supporting rocker arm having ahorizontally disposed hub mounted to rock on said stud, and a clampingdevice for lockingthe hub to and against oscillation on the stud, saidclamping device being carried bythe hub and arranged intermediate thelength of thelower portion thereof and provided with exterior operatingmeans and comprising means adapted to grip the lower portion of thecircumference of the stud and draw the hub down tightly onto the topsurface of the stud.

22. In combination, a horizontally disposed supporting stud, means forsupporting the same, a rocker arm at its lower end having a hub mounted.to-turn on said stud, a support fixed to and depending from said hub, acounterweight carried by said support and adjustable longitudinallythereof,

a feed carriage slidably mounted on the up per end of said arm, a worktable-mounted on said carriage, and feed works for adjusting thecarriage horizontally on the upper end of said arm.

23. I11 combination, a supporting armhaving a stud projectinghorizontally from its upper end, a feed carriage slidably mounted onsaid stud and provided with a work table, said carriage having alongitudinal socket receiving and inclosing said stud and manuallyoperated feed works between the arm and the. portion of the carriage toone side of said stud and the socket receiving the same for feeding thecarriage longitudinally of said stud.

24. In combination, an oscillating supporting arm adjustable about ahorizontal axis, a feed carriage mounted on the upper end of .said armin horizontal sliding adjustment, said carriage forming a dust shieldextending over the upper end of said arm, a work table mounted on saidcarriage,

mounted thereon and formed with a longitudinal socket intermediate itstop and bottom to receive said stud in longitudinal sliding engagement,whereby the carriage incloses and is slidablelongitudinally of said studand is supported thereby, and depends below the same and manuallycontrolled feed works between the arm and carriage forfeeding thecarriage on the stud.

26. In combination, an arm having a horizontally projecting cylindricalstud provided at its under side with a depending projection, a feedcarriage adapted to receive a work table and having a longitudi-' nalbore receiving said stud, said carriage resting on said stud inlongitudinal sliding engagement and provided at the bottom of said borewith a longitudinal groove to receive said projection, and manuallyactuated feed works between said arm and said carriage for moving thecarriage longitudinally of the stud.

27. In combination, an upwardly extending rocker arm, supporting meanstherefor, said arm at its upper end having a horizontally elongatedprojection, a horizontally elongated feed carriage mounted on saidprojection in longitudinal sliding adjustment, a work table mounted onthe upper part of said carriage and arranged above the same, andmanually actuated feed works.

comprising a portion extending transversely through said arm andlongitudinally of and into moving engagement with said carriage.

28. In combination, an arm having a laterally extending stud, awork-table feed carriage mounted on and supported by said stud inlongitudinal sliding adjustmentand formed with a rearwardly extendingshield extending over the end of said arm, whereby the stud is inclosedwithin the carriage, and manually actuated feed works between 'ihe armand carriage.

29. In combination, an arm having a horizontal stud projectingtherefrom, said arm formed with a bearing extending therethroughparallel with the stud, a work table feed carriage mounted on andsupported by the stud in longitudinal sliding engagement, said carriageformed with a longitudinal threaded bore parallel with the stud and inalinement with said bearing, a longitudinally arranged screw in saidbore and extending through said bearing, and manually controlledactuating means applied to the projecting end of said screw in rear ofsaid arm' and comprising-graduated setting means for determining thefeeding movement of. the carriage.

30. In combination, a support, a work table feed carriage mountedthereon in sliding adjustment, a hand carriage-feed lever fulcrumed tosaid support, and adjustable actuating connections from said lever 'tothe carriage comprising an adjustable graduated member whereby saidconnections can be set to determine the length of the carriage feed.-

31. In combination, a support, a feed car- .riage -in longitudinalsliding engagement therewith and provided with an actuating memberprojecting therefrom in the direcnon of the carriage feeding movementand provided with a stop, a fixed abutment opposing said stop, meanswhereby said stop a can be adjusted tovary the feeding movement of thecarriage, a hand lever fulcrumed independently of said carriage, andactuating connections between said hand lever and said actuating member.

32. In combination, a support, a feed carriage carried thereby insliding engagement therewith and provided with a threaded bore parallelwith the direction of feeding movement, said support having a bearing inalinement with said .bore and a fixed abutment adjacent said bearing, ascrew rod in longitudinal adjustment in said bore and slidably extendingthrough said bearing and provided with a stop opposing said abutment, agraduated finger knob on said rod, a sleeve on said rod between saidstop and knob and provided with an index, said rod being freely turnablein said sleeve, an actuating hand lever fulcrumed to said support, andan actuating link connection from said hand lever to said sleeve.

33. In a grinding machine, in combination, an elongated supporting studhaving a reduced extremity forming an annular thrust bearing face, a hubmounted on said stud and inclosing said bearing face and formed wit-h acontracted portion around said reduced end and provided with an annularinternal bearing face opposite said thrust bearing face of the stud.

34. In combination, a bearing stud, work holder support and adjustingmechanism comprising a radial supporting arm having a hub mounted tooscillate on said stud and held thereon against longitudinal movement,the stud and hub formed with opposing annular end thrust bearing faces,the hub .30 I said carrier to rock vertically'and proivlded having w aninternal longitudinal oil distributing groove extending to said bearingfaces, and means for supplying lubricant to said groove. I

35. In combination, an oscillatory -supporting arm having a laterallyextending stud-provided with a depending projection,

Y a work table feed carriage slidably mounted on and supported by andinclosing said stud and formed with internal longitudinal groovereceiving said projec'tipn, and provided with means I for supplyinglubricant to said groove.

36. In combination, a bearing stud, work holder supportingfiandadjustingmechanism con'iprislng annosc'illatory arm having a hub mounted tooscillate thereon,

' the stud and hub formed with opposing annular end thrust bearingfaces, limiting longitudinal movement of the hub on the stud in onedirection, means on the stud stopping movement of the hub in theopposite direction, the hub having an internal annular enlargementaround said bearing faces forming an oil groove, and means for supplyinglubricant to said groove.

37. In a grinding machine, a workrtable carrier having a raised portionat the side thereof provided with a work table-angle indicating scale, awork table mounted on with 21 depending pointer finger at its free endmovable along the edge. of said raised portion and having anindexadaptedto be brought into coincidence with any one of theindications of said scale to indicate the angle of the table.

which said table swings 38. A work table carrier provided with a raisedportion having a curved longitudinal edge and having angleindicatinggraduations, in combination with a tiltable work table provided withclamping means and having a depending pointerswingable therewith and atits free end'movable along said edge of said segmental portion, the axison forming the center of curvature of said edge. f

39. A support, in combination'with a sliding reoiprocatory feed carriageadapted to carry the worksupport, a hand lever carried by said support,and operative --'connec-, tionsbetween said lever and said carriagewhereby the v carriage. can be rapidly moved on its feed stroke byswinging'the lever in one direction'and can be'rapidly moved on itsreturn stroke by" swinging said lever in the opposite direction;v I

4O. A:-support,-' ,in combination with a work-support feed carriage, ahand lever removably fulcrume'd'on said support, and operative carriagereciprocating connections between said lever and- 'said'carriage, saidconnectionsbeing rem'o'vably connected with said carriage.

I111 a ate ii n chine,a table carriage, a work table pivot-w -.armrockable vertically ma plane parallel with the plah of the, grindingsurface, a work-table feed carriage mounted on the upper end of said armand movable thereon transversely'ofjsaid planes and toward and fromthegrinding surface, and a supporting fulcrum for'said arm and on which thesame is rockable, said fulcrum provided with means for varying theelevation thereof.

43. A grinding machine having a work- 't-able-carrying rocker'arm, anda-supporting fulcrum for said arm provided-with and carried by a radialarm adjustable about a center. l

44. A grinding machine having acounterbalanced rocker arm, arocker-arm-support ing fulcrum, provided with andfcarried by a radialarm adjustable about a center, and

a work-table-feed carriage carried by the rocker arm and movable thereontoward and from the grinding surface. 45. A grinding machine having aworktable-carrying rocker arm counter-balanced to normally maintain theupright position, and a sup-porting fulcrum for said arm pro:

vided with supporting means radially adjustable vertically aboutahorizontal center. 46.111 a grinding machine, in combination, avertically rotatable plane grinding surface, a rocker armcounter-balanced to normally maintain its upright position, a worksupport carried-by said arm opposite said surface, and-a horizontalsupporting fulcrum for said arm bodily adjustable in a vertical planeabout a center to carry said 7 'work support to any point above or belowor to either side of the axis of rotation of said disk.

47. In combination, in a grinding'machine, a-verticallyrotatablegrinding disk,

a work support in front of said disk, and

circularlyiadjustable supporting means for said; support bodily carryingsaid support in a vertical plane about a center to a position oppositeany portionof said disk above, belowor to eithersideof the horizontalaxis of rotation thereof.

48. A grinding machine having a 'work 125 support in frontief avertically rotatory grinding surface, and adjustable supporting devicestherefor bodilycarrying sald support in a vertical-plane circularl abouta center to any position above, be ow or to either; si e of the-aipsiofirotation of the' grinding surface and embodying'means formaintaining the support in the desired ad-, justment.

right, W0rk-support-carrying rocker arm, a support therefor adjustablein a vertical plane circularly about a center to bodily carry saidvarmvertically to different eleva tions and laterally to different positionsin the same vertical plane, and means for maintaining said arm in thedesired adjustment. i

50. A grinding machine having a vertical grinding surface rotatableabout a horizontal axis, a Work support in front'of said surfaceprovided with 'acarriage, means for supporting said carriage and onwhich 7 the carriage is adjustable toward andfro'm said-surface, .saidmeanscomprising a fulcrum adjustable in a vertical plane circularlyabout a center and bodily, carrying said support about a centercoincident-with the horizontal axis otrotation of said surface, andmechanism for holding said support in the desired adjustment withrespect to said disk.

51,. A grindingvmachine having a work grinding machine having anupsupport-carrying rocker arm, and a supporting fulcrum cularlyadjustable about a center.

52. A grinding machine having a worksupp'ort-carrying rocker arm, and asupporting fulcrum therefor provided with means holding the same spacedfrom and adjustable about a horizontal center.

'53. A grinding machine having a Vertically disposed worksupportcarryingmember, a radial supporting member therefor adjustable in a verticalplane about a center, and means for holding said members in the desiredadjustment.

54:. A grinding machine having a Worktable-supporting rocker arm havinga supporting fulcrum provided with a radial supporting arm adjustable ina curved path about a fixed center.

In .testimon f whereof I affix my signature, in presence of twoWitnesses.-

CHARLES R. CARPENTER.

Witnesses:

S. M, HARBRIDGE, D. E. HOWELL.

by addressing the Commissioner of Patents,

Washington, D. 0.

therefor provided with and carried by counterbalanced means cir-

